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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 22, Iss. S5 — Aug. 25, 2014
  • pp: A1257–A1269

Design of red, green, blue transparent electrodes for flexible optical devices

Sungjun Kim, Hyung Won Cho, Kihyon Hong, Jun Ho Son, Kisoo Kim, Bonhyeong Koo, Sungjoo Kim, and Jong-Lam Lee  »View Author Affiliations


Optics Express, Vol. 22, Issue S5, pp. A1257-A1269 (2014)
http://dx.doi.org/10.1364/OE.22.0A1257


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Abstract

Controlling the wavelength of electrodes within a desirable region is important in most optoelectronic devices for enhancing their efficiencies. Here, we investigated a full-color flexible transparent electrode using a wavelength matching layer (WML). The WMLs were able to adjust the optical-phase thickness of the entire electrode by controlling refractive indices and were capable of producing desirable colors in the visible band from 470 to 610 nm. Electrodes with tungsten oxide (WO3) having a refractive index of 1.9 showed high transmittance (T = 90.5%) at 460 nm and low sheet resistance (Rs = 11.08 Ω/sq), comparable with those of indium tin oxide (ITO, T = 86.4%, Rs = 12 Ω/sq). The optimum structure of electrodes determined by optical simulation based on the characteristic matrix method agrees well with that based on the experimental method. Replacing the ITO electrode with the WO3 electrode, the luminance of blue organic light-emitting diodes (λ = 460 nm) at 222 mA/cm2 increased from 7020 to 7200 cd/m2.

© 2014 Optical Society of America

OCIS Codes
(230.0230) Optical devices : Optical devices
(230.3670) Optical devices : Light-emitting diodes

ToC Category:
Light-Emitting Diodes

History
Original Manuscript: March 12, 2014
Revised Manuscript: June 19, 2014
Manuscript Accepted: June 26, 2014
Published: July 16, 2014

Citation
Sungjun Kim, Hyung Won Cho, Kihyon Hong, Jun Ho Son, Kisoo Kim, Bonhyeong Koo, Sungjoo Kim, and Jong-Lam Lee, "Design of red, green, blue transparent electrodes for flexible optical devices," Opt. Express 22, A1257-A1269 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-S5-A1257


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